# Version 1.1 — 10 October 2026

Faster rendering with unchanged gameplay, artwork and display geometry.

- Retain unchanged wall columns when the camera is stationary.
- Invalidate cached pixels behind moving sprites and weapon animation.
- Shorter signed horizontal sprite visibility test.
- Standard CPC display and the existing three window sizes remain in use.

## Measured renderer comparison

Same scenes on all eight levels, all three views, both detail modes, weapon bob/recoil and muzzle flashes. 1536 pixel-identical frames compared against the saved pre-update version. Native Z80 harness at 4 MHz, measured in 500-cycle steps; these are renderer measurements, not complete real-hardware game FPS.

| HIGH detail | Before | 1.1 | Change |
|---|---:|---:|---:|
| FULL | 5.13 | 5.64 | +10.0 % |
| 2/3 | 7.52 | 7.93 | +5.4 % |
| 1/2 | 9.76 | 10.04 | +2.8 % |

Most of the benefit occurs while standing/aiming. Gains while continuously moving are small. No real-hardware test of this release has been performed.